Wireless station, communication system, and communication method

1. A second wireless station comprising: a communicating unit configured to transmit a packet to a first wireless station and retransmit the packet when a response signal for the packet from the first wireless station is not received by a predetermined response time limit; an acquiring unit configured to obtain from the first wireless station transmission prohibition period information indicating a transmission prohibition period for the first wireless station, during which transmission of a signal by the first wireless station is prohibited; and a postponing unit configured to: extend the predetermined response time limit that was to expire in the transmission prohibition period indicated by the acquired transmission prohibition period information such that the predetermined response time limit expires after the transmission prohibition period ends; and transmit the packet to the first wireless station during the transmission prohibition period of the first wireless station, wherein extending the predetermined response time limit comprises extending a waiting period from the transmission of the packet until the extended predetermined response time limit expires.

2. The second wireless station according to claim 1 , wherein the postponing unit is further configured to extend the predetermined response time limit if an ending of the transmission prohibition period of the first wireless station is later than the predetermined response time limit, and not extend the predetermined response time limit if the ending of the transmission prohibition period of the first wireless station is earlier than the predetermined response time limit.

3. The second wireless station according to claim 1 , wherein the acquiring unit is further configured to obtain the transmission prohibition period information included in the packet transmitted by the first wireless station.

4. The second wireless station according to claim 3 , wherein the acquiring unit is further configured to monitor a packet transmitted from the first wireless station to a wireless station other than the second wireless station and to obtain the transmission prohibition period information included in the monitored packet.

5. The second wireless station according to claim 1 , wherein the transmission prohibition period information for the first wireless station is included in a header of a packet transmitted from the first wireless station.

6. A communication system comprising: a first wireless station; and a second wireless station wirelessly coupled to the first wireless station, wherein: the first wireless station is configured to transmit to the second wireless station, a response signal for a packet received from the second wireless station, and to notify surrounding wireless stations of a transmission prohibition period of the first wireless station, during which transmission of a signal by the first wireless station is prohibited; and the second wireless station is configured to: when the response signal for the packet transmitted to the first wireless station is not received by a predetermined response time limit, retransmit the packet and extend the predetermined response time limit that is to expire in the transmission prohibition period of the first wireless station such that the predetermined response time limit expires after the transmission prohibition period ends; and transmit the packet to the first wireless station during the transmission prohibition period of the first wireless station, wherein extending the predetermined response time limit comprises extending a waiting period from the transmission of the packet until the extended predetermined response time limit expires.

7. The communication system according to claim 6 , wherein the transmission prohibition period information for the first wireless station is included in a header of a packet transmitted from the first wireless station.

8. A communication method that is executed by a first wireless station that transmits to a second wireless station, a response signal for a packet received from the second wireless station, and that is executed by the second wireless station that when the response signal to the packet transmitted to the first wireless station is not received by a predetermined response time limit, retransmits the packet, the communication method comprising: at the first wireless station, notifying surrounding wireless stations of a transmission prohibition period of the first wireless station, during which the transmission of a signal by the first wireless station is prohibited; and at the second wireless station, extending the predetermined response time limit that is to expire in the transmission prohibition period of the first wireless station, such that the predetermined response time lime expires after the transmission prohibition period ends, and transmitting the packet to the first wireless station during the transmission prohibition period of the first wireless station, wherein extending the predetermined response time limit comprises extending a waiting period from the transmission of the packet until the extended predetermined response time limit expires.

9. The communication method according to claim 8 , further comprising: at the second wireless station, obtaining from the first wireless station transmission prohibition period information indicating the transmission prohibition period for the first wireless station.

10. The communication method according to claim 8 , wherein the transmission prohibition period information for the first wireless station is included in a header of a packet transmitted from the first wireless station.